1932 Johnson K-50 Points Adjustment

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  • May 5, 2018 at 12:48 pm #9833
    Buccaneer
    Participant

      US Member

      I put the magneto back on the subject project yesterday,
      and proceeded to adjust the points. Found that it
      was a pain in the "leg" to do so.
      Forget about any form of synchronization of the pair
      of points at TDC, I was just having trouble getting
      them set close to .020 open.
      The points cam is on the flywheel, so points adjustment
      must be done with the flywheel on.
      There’s no good leverage point to gently move the
      points through the flywheel opening.

      What’s the proper way of setting these points, and do
      you attempt to sync them at all?

      Attachments:

      Prepare to be boarded!

      May 5, 2018 at 12:59 pm #75387
      squierka39
      Participant

        US Member

        Yes. Look under your flywheel for a small groove on the outer edge. Next look on the mag plate for a matching groove. When lined up the points should be just breaking. Works the same as the OMC tool and it’s repro made for the 50’s vintage motors. If your familiar with that tool, do this the same way using a multi meter. Do you have two holes in flywheel? If so one of them will line up for adjusting when the marks are lined up. This way they will be synchronized.

        May 5, 2018 at 4:38 pm #75398
        Buccaneer
        Participant

          US Member

          Squire, thanks for reminding me about the marks……. I think
          you mentioned them when I was working on the A-80.
          I’ll have to look and see if I have them.
          My flywheel only has the one hole.
          My biggest problem is getting the points to move to my
          liking through that hole…….. usually not enough,
          or too much, lol.
          At least it looks like I have good spark, so I"m off to
          a good start.

          Update- reset the points using the timing marks
          and my buzz box, which was simple to set up
          using the kill switch terminals in the mag plate handle.
          Got the points set to fire 180 deg. apart on crank rotation
          now. Before, by just setting both points at .020, the
          flywheel traveled a quarter inch past one timing mark
          before that cylinder’s points started to open.
          The first set of points I set at 020, and the second
          set ended up about .025 to get the ignition timing synchronized.
          Hopefully that’s close enough?

          Prepare to be boarded!

          May 6, 2018 at 2:10 am #75433
          squierka39
          Participant

            US Member

            That’s better than close enough, that perfect. It’s right where the factory wanted it. The gap distance really doesn’t matter, once the points are open they are open. Sounds like your going to have a good runner with this one. Can’t wait for the video, I know one is coming.

            May 6, 2018 at 12:24 pm #75442
            Buccaneer
            Participant

              US Member

              I sure hope there’s a "running" video of the K50!
              All that is left, is to clean and shine the prop,
              try to repair the broken ear on one transom mount
              screw, and repair the gas tank.
              Gas tank has one broken mounting ear, a couple of
              dents, and needs a polishing whiz, which I’m not!

              Prepare to be boarded!

              May 6, 2018 at 3:07 pm #75449
              squierka39
              Participant

                US Member

                Those ears always seem to have at least one broken. My K80 needs one too. I think Art Decalb has some repro cast, or just weld on a new ear.

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